CAREFULLY CHEK YOUR MODEL NUMBER to be this is the right filter for your Air Purifier. This filter is compatible with for air purifier models Core 400S, Core 400s-RF, Work just like that come with unit. Cost-Effective : Value pack save much cost for your all year round air cleaning need. Higher level filtration performance for long time using, It is recommended to replace filters for 6-12 months. Using an old filter lowers your air purifier's efficiency. H13 True HEPA Technology : A higher grade true HEPA material used with 360degrees Filtration, Captures 99% of particles down to 0.3 Micrometre in diameter. your indoor air quality to breath and sleep easier, avoid sniffles and sneezing. EFFICIENT ODOR REMOVAL: Activated Carbon Filter can filtering unfavorable odors and fume, including volatile compounds (VOCs), tobacco smoke, cooking smell, as well as filtering pet odors to significantly reduce household odors, creating and pure air . Easy to install: fit for Core 400S ,no more cutting for HEPA filter. Replacement your old filter without others tool, save your time and convenient. Colour:White Material:composite material Package Contents: 1 x Filter 1 x brush Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.